This is a guess, but I don't think that Faisal Shahzad, if he is indeed a terrorist, was radicalized solely by the construction in East Jerusalem of apartment buildings for Jews. This suggests the limited relevance of the "linkage" argument. - Jeffrey Goldberg.
Agreed. But if it Shahzad was not a member of Hamas or Hezbollah, it also suggests that the U.S. and Israel don't face the same terrorist enemy.